gdxrrw and R 3.3.1

From this post:

I have written a dispatch model in GAMS which optimizes by minimizing system costs. I want to loop runs of the model; Run the optimization, save the output, varying a single parameter(storageCap) -- increasing it by a small fraction each iteration, and running the model again. GDXRRW does not seem to be able to run on R v.3.3.1 -- "Bug In Your Hair".

Seems to work for me.

1. Install the R package gdxrrw:
   
   

   > install.packages("C:\\GAMS\\win64\\24.7\\gdxrrw\\win3264\\gdxrrw_1.0.0.zip",repos=NULL) Installing package into ‘C:/Users/Erwin/Documents/R/win-library/3.3’ (as ‘lib’ is unspecified) package ‘gdxrrw’ successfully unpacked and MD5 sums checked

   
   
2. Run a GAMS script like:
   
   

   set i /i1*i10/; parameter p(i); p(i) = uniform(0,1); display p; execute_unload "p.gdx",p; execute '"c:\program files\R\R-3.3.1\bin\Rscript.exe" p.R'; $onecho > p.R R.version library(gdxrrw) p<-rgdx.param("p.gdx","p"); p $offecho

I like to put external scripts at the bottom of the GAMS model in order to reduce the clutter. Background: as the $onecho is performed at compile time the script is actually written before we call it in the execute statement (which runs at execution time).

The output looks like:

--- Job Untitled_56.gms Start 08/18/16 15:29:58 24.6.1 r55820 WEX-WEI x86 64bit/MS Windows GAMS 24.6.1   Copyright (C) 1987-2016 GAMS Development. All rights reserved Licensee: Erwin Kalvelagen                               G150803/0001CV-GEN           Amsterdam Optimization Modeling Group                     DC10455 --- Starting compilation --- Untitled_56.gms(17) 3 Mb --- Starting execution: elapsed 0:00:00.013 --- Untitled_56.gms(5) 4 Mb --- GDX File C:\tmp\p.gdx --- Untitled_56.gms(6) 4 Mb                _                           platform       x86_64-w64-mingw32          arch           x86_64                      os             mingw32                     system         x86_64, mingw32             status                                     major          3                           minor          3.1                         year           2016                        month          06                          day            21                          svn rev        70800                       language       R                           version.string R version 3.3.1 (2016-06-21) nickname       Bug in Your Hair                 i          p 1   i1 0.17174713 2   i2 0.84326671 3   i3 0.55037536 4   i4 0.30113790 5   i5 0.29221212 6   i6 0.22405287 7   i7 0.34983050 8   i8 0.85627035 9   i9 0.06711372 10 i10 0.50021067 *** Status: Normal completion --- Job Untitled_56.gms Stop 08/18/16 15:29:59 elapsed 0:00:00.907